<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>10-变量的命名规范</title>
</head>
<body>
<script>
  // let if = 10
  let num1$_ = 11
  // let nav-bar = 11
  // let 1num = 10
  let pink = '老师'
  let Pink = '演员'
  console.log(pink, Pink)
</script>
</body>
</html>